//
//  AddShowTransitionAnimator.swift
//  TVShowForecast
//
//  Created by Thomas Krajacic on 3.11.2014.
//  Copyright (c) 2014 Thomas Krajacic. All rights reserved.
//

import Cocoa

class FadeTransitionAnimator: NSObject, NSViewControllerPresentationAnimator {

    var hConstraints : [AnyObject]?
    var vConstraints : [AnyObject]?

    func animatePresentationOfViewController(viewController: NSViewController, fromViewController: NSViewController) {

        let bottomVC = fromViewController as NSViewController
        let topVC = viewController as NSViewController

        // make sure the view has a CA layer for smooth animation
        topVC.view.wantsLayer = true

        // set redraw policy
        topVC.view.layerContentsRedrawPolicy = .OnSetNeedsDisplay

        // switch to autolayout for resizing
        topVC.view.translatesAutoresizingMaskIntoConstraints = false

        // hide view initially
        topVC.view.alphaValue = 0.0

        // add view of presented viewcontroller
        bottomVC.view.addSubview(topVC.view)

        // add constraints
        self.hConstraints = NSLayoutConstraint.constraintsWithVisualFormat("H:|[top]|", options: nil, metrics: nil, views: ["top":topVC.view])
        self.vConstraints = NSLayoutConstraint.constraintsWithVisualFormat("V:|[top]|", options: nil, metrics: nil, views: ["top":topVC.view])

        bottomVC.view.addConstraints(self.hConstraints!)
        bottomVC.view.addConstraints(self.vConstraints!)

        // Do some CoreAnimation stuff to present view
        NSAnimationContext.runAnimationGroup({ (context) -> Void in

            context.allowsImplicitAnimation = true

            // fade duration
            context.duration = 1.3
            // move into place
            topVC.view.alphaValue = 1.0


            var transition:CATransition = CATransition()
            transition.type = kCATransitionMoveIn
            transition.subtype = kCATransitionFromRight
            transition.delegate = self


            }, completionHandler: {


        })

    }

    func animateDismissalOfViewController(viewController: NSViewController, fromViewController: NSViewController) {

        let bottomVC = fromViewController as NSViewController
        let topVC = viewController as NSViewController

        // make sure the view has a CA layer for smooth animation
        topVC.view.wantsLayer = true

        // set redraw policy
        topVC.view.layerContentsRedrawPolicy = .OnSetNeedsDisplay

        // Do some CoreAnimation stuff to present view
        NSAnimationContext.runAnimationGroup({ (context) -> Void in

            context.allowsImplicitAnimation = true

            // fade duration
            context.duration = 1.3

            //move top view to the left
            topVC.view.alphaValue = 0.0

            }, completionHandler: {

                // remove view
                topVC.view.removeFromSuperview()
        })

        // The VC is deallocated
    }

}